What was one method the framers used to improve the chances of the Constitution being ratified?
A. changing the document so that it looked more like the Articles of Confederation
B. requiring only nine of thirteen states to ratify it instead of requiring unanimous consent
C. asking George Washington to make a speech in favor of ratification
D. forbidding the Federalists from publishing the Federalist Papers

B.  requiring only nine of thirteen states to ratify it instead of requiring unanimous consent

Explanation:

The framers used compromise in order to increase the chances of the constitution being ratified. Each of the political factions developing during this time, the federalists and anti-federalists, had different things they wanted in terms of structuring American society.

The federalists wanted a new constitution and to get rid of the Articles of Confederation. The anti-federalists, wanted to simply amend the Articles of Confederation. However, the anti-federalists were open to a new constitution as long as it had a list of individual rights that the government could not take away.

The framers compromised and gave each side something they desired. The federalists would get a new constitution and the anti-federalists would get a list of rights they were guaranteed to have. This became known as the Bill of Rights.

Read more on - link

#1 im pretty sure its a.